8213406: (fs) More than one instance of built-in FileSystem observed in heap
Reviewed-by: alanb, cushon, weijun

   1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
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  25 
  26 package sun.nio.fs;
  27 
  28 import java.nio.file.*;
  29 import java.nio.file.attribute.*;
  30 import java.nio.file.spi.FileTypeDetector;
  31 import java.io.IOException;
  32 
  33 import jdk.internal.util.StaticProperty;
  34 
  35 /**
  36  * Linux implementation of FileSystemProvider
  37  */
  38 
  39 class LinuxFileSystemProvider extends UnixFileSystemProvider {
  40     public LinuxFileSystemProvider() {
  41         super();
  42     }
  43 
  44     @Override
  45     LinuxFileSystem newFileSystem(String dir) {
  46         return new LinuxFileSystem(this, dir);
  47     }
  48 
  49     @Override
  50     LinuxFileStore getFileStore(UnixPath path) throws IOException {
  51         return new LinuxFileStore(path);
  52     }
  53 
  54     @Override
  55     @SuppressWarnings("unchecked")
  56     public <V extends FileAttributeView> V getFileAttributeView(Path obj,
  57                                                                 Class<V> type,
  58                                                                 LinkOption... options)
  59     {
  60         if (type == DosFileAttributeView.class) {
  61             return (V) new LinuxDosFileAttributeView(UnixPath.toUnixPath(obj),
  62                                                      Util.followLinks(options));
  63         }
  64         if (type == UserDefinedFileAttributeView.class) {
  65             return (V) new LinuxUserDefinedFileAttributeView(UnixPath.toUnixPath(obj),
  66                                                              Util.followLinks(options));
  67         }
  68         return super.getFileAttributeView(obj, type, options);
  69     }
  70 
  71     @Override
  72     public DynamicFileAttributeView getFileAttributeView(Path obj,
  73                                                          String name,
  74                                                          LinkOption... options)
  75     {
  76         if (name.equals("dos")) {
  77             return new LinuxDosFileAttributeView(UnixPath.toUnixPath(obj),
  78                                                  Util.followLinks(options));
  79         }
  80         if (name.equals("user")) {
  81             return new LinuxUserDefinedFileAttributeView(UnixPath.toUnixPath(obj),
  82                                                          Util.followLinks(options));
  83         }
  84         return super.getFileAttributeView(obj, name, options);
  85     }
  86 
  87     @Override
  88     @SuppressWarnings("unchecked")
  89     public <A extends BasicFileAttributes> A readAttributes(Path file,
  90                                                             Class<A> type,
  91                                                             LinkOption... options)
  92         throws IOException
  93     {
  94         if (type == DosFileAttributes.class) {
  95             DosFileAttributeView view =
  96                 getFileAttributeView(file, DosFileAttributeView.class, options);
  97             return (A) view.readAttributes();
  98         } else {
  99             return super.readAttributes(file, type, options);
 100         }
 101     }
 102 
 103     @Override
 104     FileTypeDetector getFileTypeDetector() {
 105         String userHome = StaticProperty.userHome();
 106         Path userMimeTypes = Path.of(userHome, ".mime.types");
 107         Path etcMimeTypes = Path.of("/etc/mime.types");
 108 
 109         return chain(new MimeTypesFileTypeDetector(userMimeTypes),
 110                      new MimeTypesFileTypeDetector(etcMimeTypes));
 111     }
 112 }
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